Noise reduction using IGV flow ejections
AssigneePratt & Whitney Canada Corp.
InventorHong Yu
Life of this patent
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Abstract
In one embodiment, a method for reducing noise generated by inlet guide vane (IGV) wake and rotor interaction in a turbine engine, the noise having acoustic energy substantially dominating at one or two frequencies, comprises altering noise frequencies to distribute the acoustic energy into a broadband frequency spectrum by ejecting fluid flows from holes located on a side near a trailing edge of at least one of a plurality of inlet guide vanes (IGVs), toward a rotor downstream of the IGVs to merge with an air flow guided by the side of the at least one of the IGVs for interfering with said IGV wake and rotor interaction.
Claims18
A method for reducing noise in a turbine engine having a plurality of inlet guide vanes (IGVs) and a rotor downstream of the IGVs, the method comprising:
- 1) providing pressurized air from a pressurized air source in the engine to a hollow portion of at least one of the IGVs;
- and
- 2) ejecting the pressurized air in the hollow portion through a plurality of holes located on an outer side of the at least one of the IGVs, at an angle of between 2 and 12 degrees with respect to an air flow guided by the outer side of the at least one of the IGVs toward the rotor to merge with said air flow for interfering with IGV wake and rotor interaction.
A compressor of a turbine engine, comprising a plurality of circumferentially spaced inlet guide vanes (IGVs) supported in an annular inlet duct of the turbine engine, a rotor positioned downstream of the IGVs, a plurality of discrete holes defined on an outer side of at least one of the IGVs, the holes being in fluid communication with a source of a pressurized air downstream of the rotor and being oriented in a direction at an angle between 2 and 12 degrees with respect to an air flow guided by the outer side of the at least one of the IGVs to eject respective fluid flows from the holes at said angle to merge with said air flow.
Dependencies are inferred from the claim text.